1. Department of Rheumatology and Rehabilitation, Kasr-Alainy School of Medicine, Cairo University, Giza, Egypt
2. Integrated Unit for Research in Intestinal Disorders, Department of Tropical Medicine, Hepatogastroenterology and Infectious Diseases, Kasr-Alainy School of Medicine, Cairo University, Giza, Egypt
3. Department of Dermatology, School of Medicine, Cairo University, Giza, Egypt